Important! : Idle problem..

1. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #1 22nd March 2011, 01:56

   Ok, I know theres alot of threads on this and I have searched but im still not sure. but what I do know is its not the ICV because ive changed it for a new one and its still the same. My car sometimes idles badly the needle will jump up and down around the 1000rpm mark going under and over it, it happens when stopping in traffic, when starting up after filling up with fuel, stopping at junctions etc.. sometimes it cuts out if i dont correct it by pressing the accelorator a bit. What are all my options for it to be? what is it most likely to be? any1 else had this same problem? thanks
2. user_12308 Saxperience Forum Bum Joined: Nov 2006 The Lang Toun Posts: 4133 Mk2 Clio V6 #007 of 354

   #2 22nd March 2011, 03:00

   Poor idling is a very common problem mate. Does it misfire, ie driving along and you floor the accelerator it'll judder/pause?
   
   Off the top of my head it could be:
   
   Engine Temperature Sensor (could well be this even if the temperature dial on the dash is working okay)
   Lambda Sensor
   Coilpack - unlikely
   Mass Air Flow Sensor - unlikely
   Throttle Position Sensor - most unlikely imo
3. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #3 22nd March 2011, 03:05

   It never had problems with misfiring runs pretty smooth really its just the idling its been doing it for a while now didnt bother me too much at 1st but its gettin kinda annoyin when its cutting out in traffic etc.
4. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #4 22nd March 2011, 03:07

   Oh and if its a lambda sensor does the engine management light come on? if so i could rule that one out coz thats not on, cheers
5. user_12308 Saxperience Forum Bum Joined: Nov 2006 The Lang Toun Posts: 4133 Mk2 Clio V6 #007 of 354

   #5 22nd March 2011, 03:10

   The only thing i can think of that would cause idle issues but no misfire is the icv... (and i've had my fair share of engine issues lol)
   
   Was it a brand new one icv you put in? I've had to replace a brand new one that i bought and fitted within 6 months before...
   
   The lambda might put on the EM light but if its only sometimes that you get this bad idle then it wont be on constantly.
6. kristel10589 Saxperience Post Whore Joined: Feb 2007 Posts: 5362

   #6 22nd March 2011, 03:10

   Quote:

   Originally Posted by mtpagey Poor idling is a very common problem mate. Does it misfire, ie driving along and you floor the accelerator it'll judder/pause? Off the top of my head it could be: Engine Temperature Sensor (could well be this even if the temperature dial on the dash is working okay) Lambda Sensor Coilpack - unlikely Mass Air Flow Sensor - unlikely Throttle Position Sensor - most unlikely imo

   saxos don't have MAFS, they have MAP.
   
   lambda will bring the ecu light up.
   
   try the ecu coolant sensor
7. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #7 22nd March 2011, 03:12

   Yeah it was a brand new one same part number and everything, could it be the map sensor? I think i might try cleaning out the throttle body aswell see if it helps
8. user_12308 Saxperience Forum Bum Joined: Nov 2006 The Lang Toun Posts: 4133 Mk2 Clio V6 #007 of 354

   #8 22nd March 2011, 03:18

   Quote:

   Originally Posted by kristel10589 saxos don't have MAFS, they have MAP.

   Same thing measures how much airs going into the plenum
   
   

   Quote:

   Originally Posted by kristel10589 lambda will bring the ecu light up..

   If the lamda's not working properly all the time then it will show up but if its intermittent then sometimes it doesn't light up. mine didnt when it was causing a misfire on an old vts
   
   

   Quote:

   Originally Posted by Ben_SaxoForte Yeah it was a brand new one same part number and everything, could it be the map sensor? I think i might try cleaning out the throttle body aswell see if it helps

   Cleaning the TB won't do any harm certainly. Be careful when cleaning the sensors though and just make sure they're all re-connected properly (not loose or anything)
   
   Doubt it'd be the map sensor, fowks problems never usually come down to that.
9. kristel10589 Saxperience Post Whore Joined: Feb 2007 Posts: 5362

   #9 22nd March 2011, 03:18

   try a new ecu coolant sender first.
10. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

    #10 22nd March 2011, 03:23

    Ok cheers ill try that, how much are they? (ish)
11. kristel10589 Saxperience Post Whore Joined: Feb 2007 Posts: 5362

    #11 22nd March 2011, 03:26

    Quote:

    Originally Posted by Ben_SaxoForte Ok cheers ill try that, how much are they? (ish)

    http://www.106parts.com/s2/page1.php...4=61&part=2620
    
    Im pretty sure the ecu one is the green plugged one.
12. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

    #12 22nd March 2011, 03:30

    thanks ill check it out tommorrow hopefully it will be that, if not i suppose its not too expensive and can rule it out if its not that
13. loz180691 Frequent Poster Joined: Mar 2010 Rugby Posts: 911 NaNa Gti

    #13 22nd March 2011, 09:30

    Mine is doing this and electrical problem with it I'm sure it's lamba sensor
14. haydndodds Newbie Joined: Mar 2011 Posts: 3

    #14 22nd March 2011, 09:48

    Check your fuel and oil filters mate. when was the last service?
15. djx11b Frequent Poster Joined: Mar 2008 Glasgow Posts: 565 Saxo Vts Mk1 1997

    #15 22nd March 2011, 20:08

    got the same problem have changed ever sensor over and still not fixed it.
    
    goin to try a new lambda again as last one was off another car and did help a little bit
    
    after that i'm stumped changed, throttle body, tps, icv, air temp sensor, green coolant sensor, crank sensor, new battery, car serviced with new spark plugs and oil filter, map sensor, coilpack x 2
    
    any other help would be great if anyone knows of anything else ???
16. user_47680 Infrequent Poster Joined: Oct 2010 Cornwall Posts: 236 2001 Saxo VTR

    #16 22nd April 2011, 11:04

    Any news on this? Mine does the same thing revs up and down below 1k :/
17. VTHall Saxperience Forum Bum Joined: Apr 2010 Telford Posts: 4501 Black corsa c SXI.

    #17 22nd April 2011, 11:20

    could be map sensor..